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Texas Instruments LM385MX-2.5/NOPB
- Part No.:
- LM385MX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385MX-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 3% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,198
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Product details
Overview
LM385MX-2.5/NOPB from Texas Instruments is a micropower 2-terminal band-gap voltage reference delivering a precise 2.5 V output with ±20 mV (±0.8%) initial tolerance (A grade), 0.6 Ω dynamic impedance, and operation across 20 μA–20 mA supply current. It serves as a stable reference in portable meters, battery-powered analog circuits, and precision current sources where low quiescent current and temperature stability are critical.
For engineers reviewing the LM385MX-2.5/NOPB datasheet, LM385MX-2.5/NOPB pinout, LM385MX-2.5/NOPB application, or LM385MX-2.5/NOPB equivalent, key selection considerations include its 0°C to 70°C operating range, SOIC-8 package, 30 ppm/°C temperature coefficient (X suffix), reverse breakdown voltage specification at 100 μA, and compatibility with capacitive loads up to 10 μF without oscillation.
Technical Context
The LM385MX-2.5/NOPB uses a band-gap core with on-chip trimming for tight voltage tolerance and achieves low noise (120 μV rms, 10 Hz–10 kHz) and excellent long-term stability (20 ppm over 1000 hours). Its two-terminal architecture simplifies design by eliminating separate input/output pins-current flows through the device to establish reference voltage across its terminals.
It operates as a shunt reference: reverse-biased configuration requires an external current source, and regulation occurs only when cathode-to-anode current remains within 20 μA–20 mA. The SOIC-8 package supports surface-mount assembly with JEDEC MS-012 compliance and Level-1 MSL rating for lead-free reflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±20 mV (±0.8%) at 100 μA - ensures accurate ADC/DAC biasing and sensor excitation in commercial-temperature systems. |
| Operating Current Range | 20 μA to 20 mA - enables use in ultra-low-power standby modes (e.g., 30 μA meter applications) and higher-current precision references. |
| Dynamic Impedance | 0.6 Ω at 100 μA, 20 Hz - minimizes output voltage shift under load transients, critical for high-resolution measurement front-ends. |
| Temp Coefficient (X) | 30 ppm/°C - limits voltage drift to ≤2.25 mV over 0°C–70°C ambient, supporting 12-bit+ system accuracy without calibration. |
| Wideband Noise | 120 μV rms (10 Hz–10 kHz) - low enough to avoid degrading SNR in 16-bit data acquisition systems. |
| Long-Term Stability | 20 ppm over 1000 hours - reduces recalibration frequency in field-deployed instrumentation. |
Pinout & Package
LM385MX-2.5/NOPB is housed in an 8-pin SOIC package (Package Drawing D0008A) with standard JEDEC MS-012, 1.75 mm max height, and 1.27 mm lead pitch. Pin 1 is marked by a notch or dot; pins 1–4 are on one side, 5–8 on the opposite. The device is a 2-terminal shunt reference: only Cathode (Pin 1) and Anode (Pin 8) are electrically active; all other pins are NC (no connect) and internally unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3, 4 | Cathode (active), NC (pins 2–4) | Pin 1 is cathode; pins 2–4 are unused metal leads tied to die attach pad - must be left floating or connected to cathode per layout guidelines. |
| Pins 5, 6, 7 | No Connect | Internally unconnected; no electrical function - may be grounded or left floating without impact on performance. |
| Pin 8 | Anode | Common return path for reference current; connects to system ground or current-sink node in shunt configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥10 μF output capacitance - eliminates need for external isolation resistors in battery-monitoring or sensor-reference designs. |
| Micropower Operation | 20 μA minimum operating current - extends shelf-life-equivalent battery life in portable multimeters and IoT edge sensors. |
| Low Dynamic Impedance | 0.6 Ω at 100 μA - maintains <100 μV output shift during 1 mA load steps, enabling direct drive of op-amp inputs. |
| Trimmed Initial Accuracy | ±20 mV (±0.8%) tolerance - reduces or eliminates factory calibration in cost-sensitive industrial control modules. |
| Hermetic Alternative Available | LM185H-2.5/NOPB offers −55°C to +125°C operation in TO package - provides drop-in upgrade path for extended-temperature designs. |
Applications
| Portable Digital Multimeter Reference | Low-Power Sensor Excitation |
|---|---|
Use Scenario: Battery-powered handheld DMM requiring stable 2.5 V reference for 16-bit ADC conversion over 0–70°C ambient. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation and scaling reference for analog front-end and digitization chain. Use Value: 30 μA typical operating current extends alkaline battery life beyond 1 year; ±20 mV tolerance avoids per-unit calibration. |
Use Scenario: Resistive temperature detector (RTD) bridge circuit powered from 3.3 V rail in wireless sensor node. IC Role / Device Role / Timing Role: Precision 2.5 V shunt reference establishing known excitation voltage across RTD element. Use Value: 30 ppm/°C tempco ensures <0.1°C measurement error over full operating range; low noise preserves signal integrity. |
| Micropower Current Source | Calibration Standard in Field Instruments |
Use Scenario: Programmable 100 μA–1 mA current source for gas sensor biasing in battery-operated air quality monitor. IC Role / Device Role / Timing Role: Stable voltage reference feeding precision resistor network to generate highly repeatable current. Use Value: 20 ppm/1000 hr long-term stability ensures <0.02% current drift between annual calibrations. |
Use Scenario: Portable pressure calibrator requiring traceable 2.5 V reference for internal DAC and analog output stage. IC Role / Device Role / Timing Role: Primary voltage standard used to verify and adjust output accuracy against NIST-traceable standards. Use Value: Tight ±20 mV initial tolerance and low tempco reduce test uncertainty to <0.05%, meeting ISO 17025 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BZ-2.5/NOPB | TO-92 package, 3-pin, same 2.5 V reference but rated for 0°C–70°C; higher dynamic impedance (1 Ω) and looser initial tolerance (±50 mV). | Used where through-hole assembly or manual prototyping is preferred; less suitable for high-density SMT layouts. | Select when board space allows TO-92 and lower cost outweighs SOIC's thermal and noise advantages. |
| REF3025AIDBZR | 2.5 V series reference in SOT-23; 50 μA quiescent current, 50 ppm/°C tempco, 220 μV noise; requires input voltage >2.5 V. | Applicable in fixed-supply systems where series topology simplifies current sourcing; not compatible with shunt-based topologies. | Choose for new designs needing lower noise floor and tighter tempco, accepting higher IQ and different topology constraints. |
Compared with LM385BZ-2.5/NOPB, LM385MX-2.5/NOPB delivers superior dynamic impedance and tighter initial tolerance in a space-efficient SOIC package; versus REF3025AIDBZR, it enables true shunt operation with no minimum input voltage requirement but trades off higher noise and wider tempco.
Availability
LM385MX-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensor nodes, and industrial calibration equipment requiring stable component supply across commercial temperature ranges.
Supply support for LM385MX-2.5/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision analog ICs and voltage references.
The LM385MX-2.5/NOPB belongs to TI's legacy micropower shunt reference family, designed specifically for low-cost, low-power, high-stability voltage referencing in commercial-grade portable and industrial measurement systems.
FAQ
What is the operating temperature range for LM385MX-2.5/NOPB?
The LM385MX-2.5/NOPB is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with its SOIC packaging and target applications such as handheld test equipment and consumer-grade sensors. For extended temperature operation, TI offers the LM185H-2.5/NOPB (−55°C to +125°C) in hermetic TO package.
How does LM385MX-2.5/NOPB differ from LM385M-2.5/NOPB?
The LM385MX-2.5/NOPB and LM385M-2.5/NOPB share identical electrical specifications and SOIC-8 packaging, but differ in packaging quantity and carrier: LM385MX-2.5/NOPB ships in 2500-unit tape-and-reel format, while LM385M-2.5/NOPB ships in 95-unit tubes. Both are functionally interchangeable in circuit design and layout.
Can LM385MX-2.5/NOPB be used with large output capacitors?
Yes - the LM385MX-2.5/NOPB is explicitly designed for exceptional capacitive loading tolerance, remaining stable with ≥10 μF output capacitance. This eliminates the need for series isolation resistors in applications like battery monitoring or sensor reference buffers, simplifying layout and improving transient response.
What is the meaning of the 'X' suffix in LM385MX-2.5/NOPB?
The 'X' suffix in LM385MX-2.5/NOPB indicates the device is graded for 30 ppm/°C average temperature coefficient, verified across the full 0°C–70°C operating range. This tighter tempco specification distinguishes it from standard-grade LM385M-2.5/NOPB (150 ppm/°C) and ensures higher accuracy in thermally varying environments.
Is LM385MX-2.5/NOPB RoHS compliant and lead-free?
Yes - LM385MX-2.5/NOPB is RoHS and Green compliant, with Sn (tin) lead finish and Level-1 MSL rating for lead-free reflow soldering (peak 260°C). It meets current EU RoHS substance restrictions and is suitable for Pb-free manufacturing processes without requiring special handling or exemptions.
LM385MX-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±3%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 120µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 20 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM385MX-2.5/NOPB FAQ
1.How can I place an order for LM385MX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385MX-2.5/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM385MX-2.5/NOPB reliable?
The price and inventory of LM385MX-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM385MX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM385MX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385MX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385MX-2.5/NOPB?
LM385MX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385MX-2.5/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM385MX-2.5/NOPB?
For technical support, including LM385MX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385MX-2.5/NOPB requirements.
6.How does Aetrix verify that LM385MX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385MX-2.5/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM385MX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM385MX-2.5/NOPB?
All LM385MX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385MX-2.5/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM385MX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM385MX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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